cciss: fix some magic numbers in the raid-level decoding
[linux-2.6.git] / drivers / block / cciss_scsi.c
1 /*
2  *    Disk Array driver for HP Smart Array controllers, SCSI Tape module.
3  *    (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P.
4  *
5  *    This program is free software; you can redistribute it and/or modify
6  *    it under the terms of the GNU General Public License as published by
7  *    the Free Software Foundation; version 2 of the License.
8  *
9  *    This program is distributed in the hope that it will be useful,
10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  *    General Public License for more details.
13  *
14  *    You should have received a copy of the GNU General Public License
15  *    along with this program; if not, write to the Free Software
16  *    Foundation, Inc., 59 Temple Place, Suite 300, Boston, MA
17  *    02111-1307, USA.
18  *
19  *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
20  *    
21  *    Author: Stephen M. Cameron
22  */
23 #ifdef CONFIG_CISS_SCSI_TAPE
24
25 /* Here we have code to present the driver as a scsi driver 
26    as it is simultaneously presented as a block driver.  The 
27    reason for doing this is to allow access to SCSI tape drives
28    through the array controller.  Note in particular, neither 
29    physical nor logical disks are presented through the scsi layer. */
30
31 #include <linux/timer.h>
32 #include <linux/completion.h>
33 #include <linux/slab.h>
34 #include <linux/string.h>
35
36 #include <asm/atomic.h>
37
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_host.h> 
41
42 #include "cciss_scsi.h"
43
44 #define CCISS_ABORT_MSG 0x00
45 #define CCISS_RESET_MSG 0x01
46
47 static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
48         size_t size,
49         __u8 page_code, unsigned char *scsi3addr,
50         int cmd_type);
51
52 static CommandList_struct *cmd_alloc(ctlr_info_t *h, int get_from_pool);
53 static void cmd_free(ctlr_info_t *h, CommandList_struct *c, int got_from_pool);
54
55 static int cciss_scsi_proc_info(
56                 struct Scsi_Host *sh,
57                 char *buffer, /* data buffer */
58                 char **start,      /* where data in buffer starts */
59                 off_t offset,      /* offset from start of imaginary file */
60                 int length,        /* length of data in buffer */
61                 int func);         /* 0 == read, 1 == write */
62
63 static int cciss_scsi_queue_command (struct scsi_cmnd *cmd,
64                 void (* done)(struct scsi_cmnd *));
65 static int cciss_eh_device_reset_handler(struct scsi_cmnd *);
66 static int cciss_eh_abort_handler(struct scsi_cmnd *);
67
68 static struct cciss_scsi_hba_t ccissscsi[MAX_CTLR] = {
69         { .name = "cciss0", .ndevices = 0 },
70         { .name = "cciss1", .ndevices = 0 },
71         { .name = "cciss2", .ndevices = 0 },
72         { .name = "cciss3", .ndevices = 0 },
73         { .name = "cciss4", .ndevices = 0 },
74         { .name = "cciss5", .ndevices = 0 },
75         { .name = "cciss6", .ndevices = 0 },
76         { .name = "cciss7", .ndevices = 0 },
77 };
78
79 static struct scsi_host_template cciss_driver_template = {
80         .module                 = THIS_MODULE,
81         .name                   = "cciss",
82         .proc_name              = "cciss",
83         .proc_info              = cciss_scsi_proc_info,
84         .queuecommand           = cciss_scsi_queue_command,
85         .can_queue              = SCSI_CCISS_CAN_QUEUE,
86         .this_id                = 7,
87         .sg_tablesize           = MAXSGENTRIES,
88         .cmd_per_lun            = 1,
89         .use_clustering         = DISABLE_CLUSTERING,
90         /* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */
91         .eh_device_reset_handler= cciss_eh_device_reset_handler,
92         .eh_abort_handler       = cciss_eh_abort_handler,
93 };
94
95 #pragma pack(1)
96 struct cciss_scsi_cmd_stack_elem_t {
97         CommandList_struct cmd;
98         ErrorInfo_struct Err;
99         __u32 busaddr;
100         __u32 pad;
101 };
102
103 #pragma pack()
104
105 #define CMD_STACK_SIZE (SCSI_CCISS_CAN_QUEUE * \
106                 CCISS_MAX_SCSI_DEVS_PER_HBA + 2)
107                         // plus two for init time usage
108
109 #pragma pack(1)
110 struct cciss_scsi_cmd_stack_t {
111         struct cciss_scsi_cmd_stack_elem_t *pool;
112         struct cciss_scsi_cmd_stack_elem_t *elem[CMD_STACK_SIZE];
113         dma_addr_t cmd_pool_handle;
114         int top;
115 };
116 #pragma pack()
117
118 struct cciss_scsi_adapter_data_t {
119         struct Scsi_Host *scsi_host;
120         struct cciss_scsi_cmd_stack_t cmd_stack;
121         int registered;
122         spinlock_t lock; // to protect ccissscsi[ctlr]; 
123 };
124
125 #define CPQ_TAPE_LOCK(ctlr, flags) spin_lock_irqsave( \
126         &(((struct cciss_scsi_adapter_data_t *) \
127         hba[ctlr]->scsi_ctlr)->lock), flags);
128 #define CPQ_TAPE_UNLOCK(ctlr, flags) spin_unlock_irqrestore( \
129         &(((struct cciss_scsi_adapter_data_t *) \
130         hba[ctlr]->scsi_ctlr)->lock), flags);
131
132 static CommandList_struct *
133 scsi_cmd_alloc(ctlr_info_t *h)
134 {
135         /* assume only one process in here at a time, locking done by caller. */
136         /* use CCISS_LOCK(ctlr) */
137         /* might be better to rewrite how we allocate scsi commands in a way that */
138         /* needs no locking at all. */
139
140         /* take the top memory chunk off the stack and return it, if any. */
141         struct cciss_scsi_cmd_stack_elem_t *c;
142         struct cciss_scsi_adapter_data_t *sa;
143         struct cciss_scsi_cmd_stack_t *stk;
144         u64bit temp64;
145
146         sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr;
147         stk = &sa->cmd_stack; 
148
149         if (stk->top < 0) 
150                 return NULL;
151         c = stk->elem[stk->top];        
152         /* memset(c, 0, sizeof(*c)); */
153         memset(&c->cmd, 0, sizeof(c->cmd));
154         memset(&c->Err, 0, sizeof(c->Err));
155         /* set physical addr of cmd and addr of scsi parameters */
156         c->cmd.busaddr = c->busaddr; 
157         /* (__u32) (stk->cmd_pool_handle + 
158                 (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */
159
160         temp64.val = (__u64) (c->busaddr + sizeof(CommandList_struct));
161         /* (__u64) (stk->cmd_pool_handle + 
162                 (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top) +
163                  sizeof(CommandList_struct)); */
164         stk->top--;
165         c->cmd.ErrDesc.Addr.lower = temp64.val32.lower;
166         c->cmd.ErrDesc.Addr.upper = temp64.val32.upper;
167         c->cmd.ErrDesc.Len = sizeof(ErrorInfo_struct);
168         
169         c->cmd.ctlr = h->ctlr;
170         c->cmd.err_info = &c->Err;
171
172         return (CommandList_struct *) c;
173 }
174
175 static void 
176 scsi_cmd_free(ctlr_info_t *h, CommandList_struct *cmd)
177 {
178         /* assume only one process in here at a time, locking done by caller. */
179         /* use CCISS_LOCK(ctlr) */
180         /* drop the free memory chunk on top of the stack. */
181
182         struct cciss_scsi_adapter_data_t *sa;
183         struct cciss_scsi_cmd_stack_t *stk;
184
185         sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr;
186         stk = &sa->cmd_stack; 
187         if (stk->top >= CMD_STACK_SIZE) {
188                 printk("cciss: scsi_cmd_free called too many times.\n");
189                 BUG();
190         }
191         stk->top++;
192         stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) cmd;
193 }
194
195 static int
196 scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa)
197 {
198         int i;
199         struct cciss_scsi_cmd_stack_t *stk;
200         size_t size;
201
202         stk = &sa->cmd_stack; 
203         size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE;
204
205         // pci_alloc_consistent guarantees 32-bit DMA address will
206         // be used
207
208         stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
209                 pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle);
210
211         if (stk->pool == NULL) {
212                 printk("stk->pool is null\n");
213                 return -1;
214         }
215
216         for (i=0; i<CMD_STACK_SIZE; i++) {
217                 stk->elem[i] = &stk->pool[i];
218                 stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle + 
219                         (sizeof(struct cciss_scsi_cmd_stack_elem_t) * i));
220         }
221         stk->top = CMD_STACK_SIZE-1;
222         return 0;
223 }
224
225 static void
226 scsi_cmd_stack_free(int ctlr)
227 {
228         struct cciss_scsi_adapter_data_t *sa;
229         struct cciss_scsi_cmd_stack_t *stk;
230         size_t size;
231
232         sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
233         stk = &sa->cmd_stack; 
234         if (stk->top != CMD_STACK_SIZE-1) {
235                 printk( "cciss: %d scsi commands are still outstanding.\n",
236                         CMD_STACK_SIZE - stk->top);
237                 // BUG();
238                 printk("WE HAVE A BUG HERE!!! stk=0x%p\n", stk);
239         }
240         size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE;
241
242         pci_free_consistent(hba[ctlr]->pdev, size, stk->pool, stk->cmd_pool_handle);
243         stk->pool = NULL;
244 }
245
246 #if 0
247 static int xmargin=8;
248 static int amargin=60;
249
250 static void
251 print_bytes (unsigned char *c, int len, int hex, int ascii)
252 {
253
254         int i;
255         unsigned char *x;
256
257         if (hex)
258         {
259                 x = c;
260                 for (i=0;i<len;i++)
261                 {
262                         if ((i % xmargin) == 0 && i>0) printk("\n");
263                         if ((i % xmargin) == 0) printk("0x%04x:", i);
264                         printk(" %02x", *x);
265                         x++;
266                 }
267                 printk("\n");
268         }
269         if (ascii)
270         {
271                 x = c;
272                 for (i=0;i<len;i++)
273                 {
274                         if ((i % amargin) == 0 && i>0) printk("\n");
275                         if ((i % amargin) == 0) printk("0x%04x:", i);
276                         if (*x > 26 && *x < 128) printk("%c", *x);
277                         else printk(".");
278                         x++;
279                 }
280                 printk("\n");
281         }
282 }
283
284 static void
285 print_cmd(CommandList_struct *cp)
286 {
287         printk("queue:%d\n", cp->Header.ReplyQueue);
288         printk("sglist:%d\n", cp->Header.SGList);
289         printk("sgtot:%d\n", cp->Header.SGTotal);
290         printk("Tag:0x%08x/0x%08x\n", cp->Header.Tag.upper, 
291                         cp->Header.Tag.lower);
292         printk("LUN:0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
293                 cp->Header.LUN.LunAddrBytes[0],
294                 cp->Header.LUN.LunAddrBytes[1],
295                 cp->Header.LUN.LunAddrBytes[2],
296                 cp->Header.LUN.LunAddrBytes[3],
297                 cp->Header.LUN.LunAddrBytes[4],
298                 cp->Header.LUN.LunAddrBytes[5],
299                 cp->Header.LUN.LunAddrBytes[6],
300                 cp->Header.LUN.LunAddrBytes[7]);
301         printk("CDBLen:%d\n", cp->Request.CDBLen);
302         printk("Type:%d\n",cp->Request.Type.Type);
303         printk("Attr:%d\n",cp->Request.Type.Attribute);
304         printk(" Dir:%d\n",cp->Request.Type.Direction);
305         printk("Timeout:%d\n",cp->Request.Timeout);
306         printk( "CDB: %02x %02x %02x %02x %02x %02x %02x %02x"
307                 " %02x %02x %02x %02x %02x %02x %02x %02x\n",
308                 cp->Request.CDB[0], cp->Request.CDB[1],
309                 cp->Request.CDB[2], cp->Request.CDB[3],
310                 cp->Request.CDB[4], cp->Request.CDB[5],
311                 cp->Request.CDB[6], cp->Request.CDB[7],
312                 cp->Request.CDB[8], cp->Request.CDB[9],
313                 cp->Request.CDB[10], cp->Request.CDB[11],
314                 cp->Request.CDB[12], cp->Request.CDB[13],
315                 cp->Request.CDB[14], cp->Request.CDB[15]),
316         printk("edesc.Addr: 0x%08x/0%08x, Len  = %d\n", 
317                 cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower, 
318                         cp->ErrDesc.Len);
319         printk("sgs..........Errorinfo:\n");
320         printk("scsistatus:%d\n", cp->err_info->ScsiStatus);
321         printk("senselen:%d\n", cp->err_info->SenseLen);
322         printk("cmd status:%d\n", cp->err_info->CommandStatus);
323         printk("resid cnt:%d\n", cp->err_info->ResidualCnt);
324         printk("offense size:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_size);
325         printk("offense byte:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_num);
326         printk("offense value:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_value);
327                         
328 }
329
330 #endif
331
332 static int 
333 find_bus_target_lun(int ctlr, int *bus, int *target, int *lun)
334 {
335         /* finds an unused bus, target, lun for a new device */
336         /* assumes hba[ctlr]->scsi_ctlr->lock is held */ 
337         int i, found=0;
338         unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA];
339
340         memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA);
341
342         target_taken[SELF_SCSI_ID] = 1; 
343         for (i=0;i<ccissscsi[ctlr].ndevices;i++)
344                 target_taken[ccissscsi[ctlr].dev[i].target] = 1;
345         
346         for (i=0;i<CCISS_MAX_SCSI_DEVS_PER_HBA;i++) {
347                 if (!target_taken[i]) {
348                         *bus = 0; *target=i; *lun = 0; found=1;
349                         break;
350                 }
351         }
352         return (!found);        
353 }
354 struct scsi2map {
355         char scsi3addr[8];
356         int bus, target, lun;
357 };
358
359 static int 
360 cciss_scsi_add_entry(int ctlr, int hostno, 
361                 struct cciss_scsi_dev_t *device,
362                 struct scsi2map *added, int *nadded)
363 {
364         /* assumes hba[ctlr]->scsi_ctlr->lock is held */ 
365         int n = ccissscsi[ctlr].ndevices;
366         struct cciss_scsi_dev_t *sd;
367         int i, bus, target, lun;
368         unsigned char addr1[8], addr2[8];
369
370         if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
371                 printk("cciss%d: Too many devices, "
372                         "some will be inaccessible.\n", ctlr);
373                 return -1;
374         }
375
376         bus = target = -1;
377         lun = 0;
378         /* Is this device a non-zero lun of a multi-lun device */
379         /* byte 4 of the 8-byte LUN addr will contain the logical unit no. */
380         if (device->scsi3addr[4] != 0) {
381                 /* Search through our list and find the device which */
382                 /* has the same 8 byte LUN address, excepting byte 4. */
383                 /* Assign the same bus and target for this new LUN. */
384                 /* Use the logical unit number from the firmware. */
385                 memcpy(addr1, device->scsi3addr, 8);
386                 addr1[4] = 0;
387                 for (i = 0; i < n; i++) {
388                         sd = &ccissscsi[ctlr].dev[i];
389                         memcpy(addr2, sd->scsi3addr, 8);
390                         addr2[4] = 0;
391                         /* differ only in byte 4? */
392                         if (memcmp(addr1, addr2, 8) == 0) {
393                                 bus = sd->bus;
394                                 target = sd->target;
395                                 lun = device->scsi3addr[4];
396                                 break;
397                         }
398                 }
399         }
400
401         sd = &ccissscsi[ctlr].dev[n];
402         if (lun == 0) {
403                 if (find_bus_target_lun(ctlr,
404                         &sd->bus, &sd->target, &sd->lun) != 0)
405                         return -1;
406         } else {
407                 sd->bus = bus;
408                 sd->target = target;
409                 sd->lun = lun;
410         }
411         added[*nadded].bus = sd->bus;
412         added[*nadded].target = sd->target;
413         added[*nadded].lun = sd->lun;
414         (*nadded)++;
415
416         memcpy(sd->scsi3addr, device->scsi3addr, 8);
417         memcpy(sd->vendor, device->vendor, sizeof(sd->vendor));
418         memcpy(sd->revision, device->revision, sizeof(sd->revision));
419         memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
420         sd->devtype = device->devtype;
421
422         ccissscsi[ctlr].ndevices++;
423
424         /* initially, (before registering with scsi layer) we don't 
425            know our hostno and we don't want to print anything first 
426            time anyway (the scsi layer's inquiries will show that info) */
427         if (hostno != -1)
428                 printk("cciss%d: %s device c%db%dt%dl%d added.\n", 
429                         ctlr, scsi_device_type(sd->devtype), hostno,
430                         sd->bus, sd->target, sd->lun);
431         return 0;
432 }
433
434 static void
435 cciss_scsi_remove_entry(int ctlr, int hostno, int entry,
436         struct scsi2map *removed, int *nremoved)
437 {
438         /* assumes hba[ctlr]->scsi_ctlr->lock is held */ 
439         int i;
440         struct cciss_scsi_dev_t sd;
441
442         if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return;
443         sd = ccissscsi[ctlr].dev[entry];
444         removed[*nremoved].bus    = sd.bus;
445         removed[*nremoved].target = sd.target;
446         removed[*nremoved].lun    = sd.lun;
447         (*nremoved)++;
448         for (i=entry;i<ccissscsi[ctlr].ndevices-1;i++)
449                 ccissscsi[ctlr].dev[i] = ccissscsi[ctlr].dev[i+1];
450         ccissscsi[ctlr].ndevices--;
451         printk("cciss%d: %s device c%db%dt%dl%d removed.\n",
452                 ctlr, scsi_device_type(sd.devtype), hostno,
453                         sd.bus, sd.target, sd.lun);
454 }
455
456
457 #define SCSI3ADDR_EQ(a,b) ( \
458         (a)[7] == (b)[7] && \
459         (a)[6] == (b)[6] && \
460         (a)[5] == (b)[5] && \
461         (a)[4] == (b)[4] && \
462         (a)[3] == (b)[3] && \
463         (a)[2] == (b)[2] && \
464         (a)[1] == (b)[1] && \
465         (a)[0] == (b)[0])
466
467 static void fixup_botched_add(int ctlr, char *scsi3addr)
468 {
469         /* called when scsi_add_device fails in order to re-adjust */
470         /* ccissscsi[] to match the mid layer's view. */
471         unsigned long flags;
472         int i, j;
473         CPQ_TAPE_LOCK(ctlr, flags);
474         for (i = 0; i < ccissscsi[ctlr].ndevices; i++) {
475                 if (memcmp(scsi3addr,
476                                 ccissscsi[ctlr].dev[i].scsi3addr, 8) == 0) {
477                         for (j = i; j < ccissscsi[ctlr].ndevices-1; j++)
478                                 ccissscsi[ctlr].dev[j] =
479                                         ccissscsi[ctlr].dev[j+1];
480                         ccissscsi[ctlr].ndevices--;
481                         break;
482                 }
483         }
484         CPQ_TAPE_UNLOCK(ctlr, flags);
485 }
486
487 static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
488         struct cciss_scsi_dev_t *dev2)
489 {
490         return dev1->devtype == dev2->devtype &&
491                 memcmp(dev1->scsi3addr, dev2->scsi3addr,
492                         sizeof(dev1->scsi3addr)) == 0 &&
493                 memcmp(dev1->device_id, dev2->device_id,
494                         sizeof(dev1->device_id)) == 0 &&
495                 memcmp(dev1->vendor, dev2->vendor,
496                         sizeof(dev1->vendor)) == 0 &&
497                 memcmp(dev1->model, dev2->model,
498                         sizeof(dev1->model)) == 0 &&
499                 memcmp(dev1->revision, dev2->revision,
500                         sizeof(dev1->revision)) == 0;
501 }
502
503 static int
504 adjust_cciss_scsi_table(int ctlr, int hostno,
505         struct cciss_scsi_dev_t sd[], int nsds)
506 {
507         /* sd contains scsi3 addresses and devtypes, but
508            bus target and lun are not filled in.  This funciton
509            takes what's in sd to be the current and adjusts
510            ccissscsi[] to be in line with what's in sd. */ 
511
512         int i,j, found, changes=0;
513         struct cciss_scsi_dev_t *csd;
514         unsigned long flags;
515         struct scsi2map *added, *removed;
516         int nadded, nremoved;
517         struct Scsi_Host *sh = NULL;
518
519         added = kzalloc(sizeof(*added) * CCISS_MAX_SCSI_DEVS_PER_HBA,
520                         GFP_KERNEL);
521         removed = kzalloc(sizeof(*removed) * CCISS_MAX_SCSI_DEVS_PER_HBA,
522                         GFP_KERNEL);
523
524         if (!added || !removed) {
525                 printk(KERN_WARNING "cciss%d: Out of memory in "
526                         "adjust_cciss_scsi_table\n", ctlr);
527                 goto free_and_out;
528         }
529
530         CPQ_TAPE_LOCK(ctlr, flags);
531
532         if (hostno != -1)  /* if it's not the first time... */
533                 sh = ((struct cciss_scsi_adapter_data_t *)
534                         hba[ctlr]->scsi_ctlr)->scsi_host;
535
536         /* find any devices in ccissscsi[] that are not in 
537            sd[] and remove them from ccissscsi[] */
538
539         i = 0;
540         nremoved = 0;
541         nadded = 0;
542         while(i<ccissscsi[ctlr].ndevices) {
543                 csd = &ccissscsi[ctlr].dev[i];
544                 found=0;
545                 for (j=0;j<nsds;j++) {
546                         if (SCSI3ADDR_EQ(sd[j].scsi3addr,
547                                 csd->scsi3addr)) {
548                                 if (device_is_the_same(&sd[j], csd))
549                                         found=2;
550                                 else
551                                         found=1;
552                                 break;
553                         }
554                 }
555
556                 if (found == 0) { /* device no longer present. */ 
557                         changes++;
558                         /* printk("cciss%d: %s device c%db%dt%dl%d removed.\n",
559                                 ctlr, scsi_device_type(csd->devtype), hostno,
560                                         csd->bus, csd->target, csd->lun); */
561                         cciss_scsi_remove_entry(ctlr, hostno, i,
562                                 removed, &nremoved);
563                         /* remove ^^^, hence i not incremented */
564                 } else if (found == 1) { /* device is different in some way */
565                         changes++;
566                         printk("cciss%d: device c%db%dt%dl%d has changed.\n",
567                                 ctlr, hostno, csd->bus, csd->target, csd->lun);
568                         cciss_scsi_remove_entry(ctlr, hostno, i,
569                                 removed, &nremoved);
570                         /* remove ^^^, hence i not incremented */
571                         if (cciss_scsi_add_entry(ctlr, hostno, &sd[j],
572                                 added, &nadded) != 0)
573                                 /* we just removed one, so add can't fail. */
574                                         BUG();
575                         csd->devtype = sd[j].devtype;
576                         memcpy(csd->device_id, sd[j].device_id,
577                                 sizeof(csd->device_id));
578                         memcpy(csd->vendor, sd[j].vendor,
579                                 sizeof(csd->vendor));
580                         memcpy(csd->model, sd[j].model,
581                                 sizeof(csd->model));
582                         memcpy(csd->revision, sd[j].revision,
583                                 sizeof(csd->revision));
584                 } else          /* device is same as it ever was, */
585                         i++;    /* so just move along. */
586         }
587
588         /* Now, make sure every device listed in sd[] is also
589            listed in ccissscsi[], adding them if they aren't found */
590
591         for (i=0;i<nsds;i++) {
592                 found=0;
593                 for (j=0;j<ccissscsi[ctlr].ndevices;j++) {
594                         csd = &ccissscsi[ctlr].dev[j];
595                         if (SCSI3ADDR_EQ(sd[i].scsi3addr,
596                                 csd->scsi3addr)) {
597                                 if (device_is_the_same(&sd[i], csd))
598                                         found=2;        /* found device */
599                                 else
600                                         found=1;        /* found a bug. */
601                                 break;
602                         }
603                 }
604                 if (!found) {
605                         changes++;
606                         if (cciss_scsi_add_entry(ctlr, hostno, &sd[i],
607                                 added, &nadded) != 0)
608                                 break;
609                 } else if (found == 1) {
610                         /* should never happen... */
611                         changes++;
612                         printk(KERN_WARNING "cciss%d: device "
613                                 "unexpectedly changed\n", ctlr);
614                         /* but if it does happen, we just ignore that device */
615                 }
616         }
617         CPQ_TAPE_UNLOCK(ctlr, flags);
618
619         /* Don't notify scsi mid layer of any changes the first time through */
620         /* (or if there are no changes) scsi_scan_host will do it later the */
621         /* first time through. */
622         if (hostno == -1 || !changes)
623                 goto free_and_out;
624
625         /* Notify scsi mid layer of any removed devices */
626         for (i = 0; i < nremoved; i++) {
627                 struct scsi_device *sdev =
628                         scsi_device_lookup(sh, removed[i].bus,
629                                 removed[i].target, removed[i].lun);
630                 if (sdev != NULL) {
631                         scsi_remove_device(sdev);
632                         scsi_device_put(sdev);
633                 } else {
634                         /* We don't expect to get here. */
635                         /* future cmds to this device will get selection */
636                         /* timeout as if the device was gone. */
637                         printk(KERN_WARNING "cciss%d: didn't find "
638                                 "c%db%dt%dl%d\n for removal.",
639                                 ctlr, hostno, removed[i].bus,
640                                 removed[i].target, removed[i].lun);
641                 }
642         }
643
644         /* Notify scsi mid layer of any added devices */
645         for (i = 0; i < nadded; i++) {
646                 int rc;
647                 rc = scsi_add_device(sh, added[i].bus,
648                         added[i].target, added[i].lun);
649                 if (rc == 0)
650                         continue;
651                 printk(KERN_WARNING "cciss%d: scsi_add_device "
652                         "c%db%dt%dl%d failed, device not added.\n",
653                         ctlr, hostno,
654                         added[i].bus, added[i].target, added[i].lun);
655                 /* now we have to remove it from ccissscsi, */
656                 /* since it didn't get added to scsi mid layer */
657                 fixup_botched_add(ctlr, added[i].scsi3addr);
658         }
659
660 free_and_out:
661         kfree(added);
662         kfree(removed);
663         return 0;
664 }
665
666 static int
667 lookup_scsi3addr(int ctlr, int bus, int target, int lun, char *scsi3addr)
668 {
669         int i;
670         struct cciss_scsi_dev_t *sd;
671         unsigned long flags;
672
673         CPQ_TAPE_LOCK(ctlr, flags);
674         for (i=0;i<ccissscsi[ctlr].ndevices;i++) {
675                 sd = &ccissscsi[ctlr].dev[i];
676                 if (sd->bus == bus &&
677                     sd->target == target &&
678                     sd->lun == lun) {
679                         memcpy(scsi3addr, &sd->scsi3addr[0], 8);
680                         CPQ_TAPE_UNLOCK(ctlr, flags);
681                         return 0;
682                 }
683         }
684         CPQ_TAPE_UNLOCK(ctlr, flags);
685         return -1;
686 }
687
688 static void 
689 cciss_scsi_setup(int cntl_num)
690 {
691         struct cciss_scsi_adapter_data_t * shba;
692
693         ccissscsi[cntl_num].ndevices = 0;
694         shba = (struct cciss_scsi_adapter_data_t *)
695                 kmalloc(sizeof(*shba), GFP_KERNEL);     
696         if (shba == NULL)
697                 return;
698         shba->scsi_host = NULL;
699         spin_lock_init(&shba->lock);
700         shba->registered = 0;
701         if (scsi_cmd_stack_setup(cntl_num, shba) != 0) {
702                 kfree(shba);
703                 shba = NULL;
704         }
705         hba[cntl_num]->scsi_ctlr = (void *) shba;
706         return;
707 }
708
709 static void
710 complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
711 {
712         struct scsi_cmnd *cmd;
713         ctlr_info_t *ctlr;
714         ErrorInfo_struct *ei;
715
716         ei = cp->err_info;
717
718         /* First, see if it was a message rather than a command */
719         if (cp->Request.Type.Type == TYPE_MSG)  {
720                 cp->cmd_type = CMD_MSG_DONE;
721                 return;
722         }
723
724         cmd = (struct scsi_cmnd *) cp->scsi_cmd;        
725         ctlr = hba[cp->ctlr];
726
727         scsi_dma_unmap(cmd);
728
729         cmd->result = (DID_OK << 16);           /* host byte */
730         cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
731         /* cmd->result |= (GOOD < 1); */                /* status byte */
732
733         cmd->result |= (ei->ScsiStatus);
734         /* printk("Scsistatus is 0x%02x\n", ei->ScsiStatus);  */
735
736         /* copy the sense data whether we need to or not. */
737
738         memcpy(cmd->sense_buffer, ei->SenseInfo, 
739                 ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
740                         SCSI_SENSE_BUFFERSIZE : 
741                         ei->SenseLen);
742         scsi_set_resid(cmd, ei->ResidualCnt);
743
744         if(ei->CommandStatus != 0) 
745         { /* an error has occurred */ 
746                 switch(ei->CommandStatus)
747                 {
748                         case CMD_TARGET_STATUS:
749                                 /* Pass it up to the upper layers... */
750                                 if( ei->ScsiStatus)
751                                 {
752 #if 0
753                                         printk(KERN_WARNING "cciss: cmd %p "
754                                         "has SCSI Status = %x\n",
755                                                 cp,  
756                                                 ei->ScsiStatus); 
757 #endif
758                                         cmd->result |= (ei->ScsiStatus < 1);
759                                 }
760                                 else {  /* scsi status is zero??? How??? */
761                                         
762         /* Ordinarily, this case should never happen, but there is a bug
763            in some released firmware revisions that allows it to happen
764            if, for example, a 4100 backplane loses power and the tape
765            drive is in it.  We assume that it's a fatal error of some
766            kind because we can't show that it wasn't. We will make it
767            look like selection timeout since that is the most common
768            reason for this to occur, and it's severe enough. */
769
770                                         cmd->result = DID_NO_CONNECT << 16;
771                                 }
772                         break;
773                         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
774                         break;
775                         case CMD_DATA_OVERRUN:
776                                 printk(KERN_WARNING "cciss: cp %p has"
777                                         " completed with data overrun "
778                                         "reported\n", cp);
779                         break;
780                         case CMD_INVALID: {
781                                 /* print_bytes(cp, sizeof(*cp), 1, 0);
782                                 print_cmd(cp); */
783      /* We get CMD_INVALID if you address a non-existent tape drive instead
784         of a selection timeout (no response).  You will see this if you yank 
785         out a tape drive, then try to access it. This is kind of a shame
786         because it means that any other CMD_INVALID (e.g. driver bug) will
787         get interpreted as a missing target. */
788                                 cmd->result = DID_NO_CONNECT << 16;
789                                 }
790                         break;
791                         case CMD_PROTOCOL_ERR:
792                                 printk(KERN_WARNING "cciss: cp %p has "
793                                         "protocol error \n", cp);
794                         break;
795                         case CMD_HARDWARE_ERR:
796                                 cmd->result = DID_ERROR << 16;
797                                 printk(KERN_WARNING "cciss: cp %p had " 
798                                         " hardware error\n", cp);
799                         break;
800                         case CMD_CONNECTION_LOST:
801                                 cmd->result = DID_ERROR << 16;
802                                 printk(KERN_WARNING "cciss: cp %p had "
803                                         "connection lost\n", cp);
804                         break;
805                         case CMD_ABORTED:
806                                 cmd->result = DID_ABORT << 16;
807                                 printk(KERN_WARNING "cciss: cp %p was "
808                                         "aborted\n", cp);
809                         break;
810                         case CMD_ABORT_FAILED:
811                                 cmd->result = DID_ERROR << 16;
812                                 printk(KERN_WARNING "cciss: cp %p reports "
813                                         "abort failed\n", cp);
814                         break;
815                         case CMD_UNSOLICITED_ABORT:
816                                 cmd->result = DID_ABORT << 16;
817                                 printk(KERN_WARNING "cciss: cp %p aborted "
818                                         "do to an unsolicited abort\n", cp);
819                         break;
820                         case CMD_TIMEOUT:
821                                 cmd->result = DID_TIME_OUT << 16;
822                                 printk(KERN_WARNING "cciss: cp %p timedout\n",
823                                         cp);
824                         break;
825                         default:
826                                 cmd->result = DID_ERROR << 16;
827                                 printk(KERN_WARNING "cciss: cp %p returned "
828                                         "unknown status %x\n", cp, 
829                                                 ei->CommandStatus); 
830                 }
831         }
832         // printk("c:%p:c%db%dt%dl%d ", cmd, ctlr->ctlr, cmd->channel, 
833         //      cmd->target, cmd->lun);
834         cmd->scsi_done(cmd);
835         scsi_cmd_free(ctlr, cp);
836 }
837
838 static int
839 cciss_scsi_detect(int ctlr)
840 {
841         struct Scsi_Host *sh;
842         int error;
843
844         sh = scsi_host_alloc(&cciss_driver_template, sizeof(struct ctlr_info *));
845         if (sh == NULL)
846                 goto fail;
847         sh->io_port = 0;        // good enough?  FIXME, 
848         sh->n_io_port = 0;      // I don't think we use these two...
849         sh->this_id = SELF_SCSI_ID;  
850
851         ((struct cciss_scsi_adapter_data_t *) 
852                 hba[ctlr]->scsi_ctlr)->scsi_host = (void *) sh;
853         sh->hostdata[0] = (unsigned long) hba[ctlr];
854         sh->irq = hba[ctlr]->intr[SIMPLE_MODE_INT];
855         sh->unique_id = sh->irq;
856         error = scsi_add_host(sh, &hba[ctlr]->pdev->dev);
857         if (error)
858                 goto fail_host_put;
859         scsi_scan_host(sh);
860         return 1;
861
862  fail_host_put:
863         scsi_host_put(sh);
864  fail:
865         return 0;
866 }
867
868 static void
869 cciss_unmap_one(struct pci_dev *pdev,
870                 CommandList_struct *cp,
871                 size_t buflen,
872                 int data_direction)
873 {
874         u64bit addr64;
875
876         addr64.val32.lower = cp->SG[0].Addr.lower;
877         addr64.val32.upper = cp->SG[0].Addr.upper;
878         pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction);
879 }
880
881 static void
882 cciss_map_one(struct pci_dev *pdev,
883                 CommandList_struct *cp,
884                 unsigned char *buf,
885                 size_t buflen,
886                 int data_direction)
887 {
888         __u64 addr64;
889
890         addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction);
891         cp->SG[0].Addr.lower = 
892           (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
893         cp->SG[0].Addr.upper =
894           (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
895         cp->SG[0].Len = buflen;
896         cp->Header.SGList = (__u8) 1;   /* no. SGs contig in this cmd */
897         cp->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
898 }
899
900 static int
901 cciss_scsi_do_simple_cmd(ctlr_info_t *c,
902                         CommandList_struct *cp,
903                         unsigned char *scsi3addr, 
904                         unsigned char *cdb,
905                         unsigned char cdblen,
906                         unsigned char *buf, int bufsize,
907                         int direction)
908 {
909         unsigned long flags;
910         DECLARE_COMPLETION_ONSTACK(wait);
911
912         cp->cmd_type = CMD_IOCTL_PEND;          // treat this like an ioctl 
913         cp->scsi_cmd = NULL;
914         cp->Header.ReplyQueue = 0;  // unused in simple mode
915         memcpy(&cp->Header.LUN, scsi3addr, sizeof(cp->Header.LUN));
916         cp->Header.Tag.lower = cp->busaddr;  // Use k. address of cmd as tag
917         // Fill in the request block...
918
919         /* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n", 
920                 scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
921                 scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */
922
923         memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB));
924         memcpy(cp->Request.CDB, cdb, cdblen);
925         cp->Request.Timeout = 0;
926         cp->Request.CDBLen = cdblen;
927         cp->Request.Type.Type = TYPE_CMD;
928         cp->Request.Type.Attribute = ATTR_SIMPLE;
929         cp->Request.Type.Direction = direction;
930
931         /* Fill in the SG list and do dma mapping */
932         cciss_map_one(c->pdev, cp, (unsigned char *) buf,
933                         bufsize, DMA_FROM_DEVICE); 
934
935         cp->waiting = &wait;
936
937         /* Put the request on the tail of the request queue */
938         spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
939         addQ(&c->reqQ, cp);
940         c->Qdepth++;
941         start_io(c);
942         spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
943
944         wait_for_completion(&wait);
945
946         /* undo the dma mapping */
947         cciss_unmap_one(c->pdev, cp, bufsize, DMA_FROM_DEVICE);
948         return(0);
949 }
950
951 static void 
952 cciss_scsi_interpret_error(CommandList_struct *cp)
953 {
954         ErrorInfo_struct *ei;
955
956         ei = cp->err_info; 
957         switch(ei->CommandStatus)
958         {
959                 case CMD_TARGET_STATUS:
960                         printk(KERN_WARNING "cciss: cmd %p has "
961                                 "completed with errors\n", cp);
962                         printk(KERN_WARNING "cciss: cmd %p "
963                                 "has SCSI Status = %x\n",
964                                         cp,  
965                                         ei->ScsiStatus);
966                         if (ei->ScsiStatus == 0)
967                                 printk(KERN_WARNING 
968                                 "cciss:SCSI status is abnormally zero.  "
969                                 "(probably indicates selection timeout "
970                                 "reported incorrectly due to a known "
971                                 "firmware bug, circa July, 2001.)\n");
972                 break;
973                 case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
974                         printk("UNDERRUN\n");
975                 break;
976                 case CMD_DATA_OVERRUN:
977                         printk(KERN_WARNING "cciss: cp %p has"
978                                 " completed with data overrun "
979                                 "reported\n", cp);
980                 break;
981                 case CMD_INVALID: {
982                         /* controller unfortunately reports SCSI passthru's */
983                         /* to non-existent targets as invalid commands. */
984                         printk(KERN_WARNING "cciss: cp %p is "
985                                 "reported invalid (probably means "
986                                 "target device no longer present)\n", 
987                                 cp); 
988                         /* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0);
989                         print_cmd(cp);  */
990                         }
991                 break;
992                 case CMD_PROTOCOL_ERR:
993                         printk(KERN_WARNING "cciss: cp %p has "
994                                 "protocol error \n", cp);
995                 break;
996                 case CMD_HARDWARE_ERR:
997                         /* cmd->result = DID_ERROR << 16; */
998                         printk(KERN_WARNING "cciss: cp %p had " 
999                                 " hardware error\n", cp);
1000                 break;
1001                 case CMD_CONNECTION_LOST:
1002                         printk(KERN_WARNING "cciss: cp %p had "
1003                                 "connection lost\n", cp);
1004                 break;
1005                 case CMD_ABORTED:
1006                         printk(KERN_WARNING "cciss: cp %p was "
1007                                 "aborted\n", cp);
1008                 break;
1009                 case CMD_ABORT_FAILED:
1010                         printk(KERN_WARNING "cciss: cp %p reports "
1011                                 "abort failed\n", cp);
1012                 break;
1013                 case CMD_UNSOLICITED_ABORT:
1014                         printk(KERN_WARNING "cciss: cp %p aborted "
1015                                 "do to an unsolicited abort\n", cp);
1016                 break;
1017                 case CMD_TIMEOUT:
1018                         printk(KERN_WARNING "cciss: cp %p timedout\n",
1019                                 cp);
1020                 break;
1021                 default:
1022                         printk(KERN_WARNING "cciss: cp %p returned "
1023                                 "unknown status %x\n", cp, 
1024                                         ei->CommandStatus); 
1025         }
1026 }
1027
1028 static int
1029 cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr, 
1030         unsigned char page, unsigned char *buf,
1031         unsigned char bufsize)
1032 {
1033         int rc;
1034         CommandList_struct *cp;
1035         char cdb[6];
1036         ErrorInfo_struct *ei;
1037         unsigned long flags;
1038
1039         spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
1040         cp = scsi_cmd_alloc(c);
1041         spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
1042
1043         if (cp == NULL) {                       /* trouble... */
1044                 printk("cmd_alloc returned NULL!\n");
1045                 return -1;
1046         }
1047
1048         ei = cp->err_info; 
1049
1050         cdb[0] = CISS_INQUIRY;
1051         cdb[1] = (page != 0);
1052         cdb[2] = page;
1053         cdb[3] = 0;
1054         cdb[4] = bufsize;
1055         cdb[5] = 0;
1056         rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb, 
1057                                 6, buf, bufsize, XFER_READ);
1058
1059         if (rc != 0) return rc; /* something went wrong */
1060
1061         if (ei->CommandStatus != 0 && 
1062             ei->CommandStatus != CMD_DATA_UNDERRUN) {
1063                 cciss_scsi_interpret_error(cp);
1064                 rc = -1;
1065         }
1066         spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
1067         scsi_cmd_free(c, cp);
1068         spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
1069         return rc;      
1070 }
1071
1072 /* Get the device id from inquiry page 0x83 */
1073 static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr,
1074         unsigned char *device_id, int buflen)
1075 {
1076         int rc;
1077         unsigned char *buf;
1078
1079         if (buflen > 16)
1080                 buflen = 16;
1081         buf = kzalloc(64, GFP_KERNEL);
1082         if (!buf)
1083                 return -1;
1084         rc = cciss_scsi_do_inquiry(c, scsi3addr, 0x83, buf, 64);
1085         if (rc == 0)
1086                 memcpy(device_id, &buf[8], buflen);
1087         kfree(buf);
1088         return rc != 0;
1089 }
1090
1091 static int
1092 cciss_scsi_do_report_phys_luns(ctlr_info_t *c, 
1093                 ReportLunData_struct *buf, int bufsize)
1094 {
1095         int rc;
1096         CommandList_struct *cp;
1097         unsigned char cdb[12];
1098         unsigned char scsi3addr[8]; 
1099         ErrorInfo_struct *ei;
1100         unsigned long flags;
1101
1102         spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
1103         cp = scsi_cmd_alloc(c);
1104         spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
1105         if (cp == NULL) {                       /* trouble... */
1106                 printk("cmd_alloc returned NULL!\n");
1107                 return -1;
1108         }
1109
1110         memset(&scsi3addr[0], 0, 8); /* address the controller */
1111         cdb[0] = CISS_REPORT_PHYS;
1112         cdb[1] = 0;
1113         cdb[2] = 0;
1114         cdb[3] = 0;
1115         cdb[4] = 0;
1116         cdb[5] = 0;
1117         cdb[6] = (bufsize >> 24) & 0xFF;  //MSB
1118         cdb[7] = (bufsize >> 16) & 0xFF;
1119         cdb[8] = (bufsize >> 8) & 0xFF;
1120         cdb[9] = bufsize & 0xFF;
1121         cdb[10] = 0;
1122         cdb[11] = 0;
1123
1124         rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, 
1125                                 cdb, 12, 
1126                                 (unsigned char *) buf, 
1127                                 bufsize, XFER_READ);
1128
1129         if (rc != 0) return rc; /* something went wrong */
1130
1131         ei = cp->err_info; 
1132         if (ei->CommandStatus != 0 && 
1133             ei->CommandStatus != CMD_DATA_UNDERRUN) {
1134                 cciss_scsi_interpret_error(cp);
1135                 rc = -1;
1136         }
1137         spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
1138         scsi_cmd_free(c, cp);
1139         spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
1140         return rc;      
1141 }
1142
1143 static void
1144 cciss_update_non_disk_devices(int cntl_num, int hostno)
1145 {
1146         /* the idea here is we could get notified from /proc
1147            that some devices have changed, so we do a report 
1148            physical luns cmd, and adjust our list of devices 
1149            accordingly.  (We can't rely on the scsi-mid layer just
1150            doing inquiries, because the "busses" that the scsi 
1151            mid-layer probes are totally fabricated by this driver,
1152            so new devices wouldn't show up.
1153
1154            the scsi3addr's of devices won't change so long as the 
1155            adapter is not reset.  That means we can rescan and 
1156            tell which devices we already know about, vs. new 
1157            devices, vs.  disappearing devices.
1158
1159            Also, if you yank out a tape drive, then put in a disk
1160            in it's place, (say, a configured volume from another 
1161            array controller for instance)  _don't_ poke this driver 
1162            (so it thinks it's still a tape, but _do_ poke the scsi 
1163            mid layer, so it does an inquiry... the scsi mid layer 
1164            will see the physical disk.  This would be bad.  Need to
1165            think about how to prevent that.  One idea would be to 
1166            snoop all scsi responses and if an inquiry repsonse comes
1167            back that reports a disk, chuck it an return selection
1168            timeout instead and adjust our table...  Not sure i like
1169            that though.  
1170
1171          */
1172 #define OBDR_TAPE_INQ_SIZE 49
1173 #define OBDR_TAPE_SIG "$DR-10"
1174         ReportLunData_struct *ld_buff;
1175         unsigned char *inq_buff;
1176         unsigned char scsi3addr[8];
1177         ctlr_info_t *c;
1178         __u32 num_luns=0;
1179         unsigned char *ch;
1180         struct cciss_scsi_dev_t *currentsd, *this_device;
1181         int ncurrent=0;
1182         int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
1183         int i;
1184
1185         c = (ctlr_info_t *) hba[cntl_num];      
1186         ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
1187         inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1188         currentsd = kzalloc(sizeof(*currentsd) *
1189                         (CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL);
1190         if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) {
1191                 printk(KERN_ERR "cciss: out of memory\n");
1192                 goto out;
1193         }
1194         this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
1195         if (cciss_scsi_do_report_phys_luns(c, ld_buff, reportlunsize) == 0) {
1196                 ch = &ld_buff->LUNListLength[0];
1197                 num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
1198                 if (num_luns > CISS_MAX_PHYS_LUN) {
1199                         printk(KERN_WARNING 
1200                                 "cciss: Maximum physical LUNs (%d) exceeded.  "
1201                                 "%d LUNs ignored.\n", CISS_MAX_PHYS_LUN, 
1202                                 num_luns - CISS_MAX_PHYS_LUN);
1203                         num_luns = CISS_MAX_PHYS_LUN;
1204                 }
1205         }
1206         else {
1207                 printk(KERN_ERR  "cciss: Report physical LUNs failed.\n");
1208                 goto out;
1209         }
1210
1211
1212         /* adjust our table of devices */       
1213         for (i = 0; i < num_luns; i++) {
1214                 /* for each physical lun, do an inquiry */
1215                 if (ld_buff->LUN[i][3] & 0xC0) continue;
1216                 memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
1217                 memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
1218
1219                 if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, 0, inq_buff,
1220                         (unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
1221                         /* Inquiry failed (msg printed already) */
1222                         continue; /* so we will skip this device. */
1223
1224                 this_device->devtype = (inq_buff[0] & 0x1f);
1225                 this_device->bus = -1;
1226                 this_device->target = -1;
1227                 this_device->lun = -1;
1228                 memcpy(this_device->scsi3addr, scsi3addr, 8);
1229                 memcpy(this_device->vendor, &inq_buff[8],
1230                         sizeof(this_device->vendor));
1231                 memcpy(this_device->model, &inq_buff[16],
1232                         sizeof(this_device->model));
1233                 memcpy(this_device->revision, &inq_buff[32],
1234                         sizeof(this_device->revision));
1235                 memset(this_device->device_id, 0,
1236                         sizeof(this_device->device_id));
1237                 cciss_scsi_get_device_id(hba[cntl_num], scsi3addr,
1238                         this_device->device_id, sizeof(this_device->device_id));
1239
1240                 switch (this_device->devtype)
1241                 {
1242                   case 0x05: /* CD-ROM */ {
1243
1244                         /* We don't *really* support actual CD-ROM devices,
1245                          * just this "One Button Disaster Recovery" tape drive
1246                          * which temporarily pretends to be a CD-ROM drive.
1247                          * So we check that the device is really an OBDR tape
1248                          * device by checking for "$DR-10" in bytes 43-48 of
1249                          * the inquiry data.
1250                          */
1251                                 char obdr_sig[7];
1252
1253                                 strncpy(obdr_sig, &inq_buff[43], 6);
1254                                 obdr_sig[6] = '\0';
1255                                 if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
1256                                         /* Not OBDR device, ignore it. */
1257                                         break;
1258                         }
1259                         /* fall through . . . */
1260                   case 0x01: /* sequential access, (tape) */
1261                   case 0x08: /* medium changer */
1262                         if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
1263                                 printk(KERN_INFO "cciss%d: %s ignored, "
1264                                         "too many devices.\n", cntl_num,
1265                                         scsi_device_type(this_device->devtype));
1266                                 break;
1267                         }
1268                         currentsd[ncurrent] = *this_device;
1269                         ncurrent++;
1270                         break;
1271                   default: 
1272                         break;
1273                 }
1274         }
1275
1276         adjust_cciss_scsi_table(cntl_num, hostno, currentsd, ncurrent);
1277 out:
1278         kfree(inq_buff);
1279         kfree(ld_buff);
1280         kfree(currentsd);
1281         return;
1282 }
1283
1284 static int
1285 is_keyword(char *ptr, int len, char *verb)  // Thanks to ncr53c8xx.c
1286 {
1287         int verb_len = strlen(verb);
1288         if (len >= verb_len && !memcmp(verb,ptr,verb_len))
1289                 return verb_len;
1290         else
1291                 return 0;
1292 }
1293
1294 static int
1295 cciss_scsi_user_command(int ctlr, int hostno, char *buffer, int length)
1296 {
1297         int arg_len;
1298
1299         if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
1300                 cciss_update_non_disk_devices(ctlr, hostno);
1301         else
1302                 return -EINVAL;
1303         return length;
1304 }
1305
1306
1307 static int
1308 cciss_scsi_proc_info(struct Scsi_Host *sh,
1309                 char *buffer, /* data buffer */
1310                 char **start,      /* where data in buffer starts */
1311                 off_t offset,      /* offset from start of imaginary file */
1312                 int length,        /* length of data in buffer */
1313                 int func)          /* 0 == read, 1 == write */
1314 {
1315
1316         int buflen, datalen;
1317         ctlr_info_t *ci;
1318         int i;
1319         int cntl_num;
1320
1321
1322         ci = (ctlr_info_t *) sh->hostdata[0];
1323         if (ci == NULL)  /* This really shouldn't ever happen. */
1324                 return -EINVAL;
1325
1326         cntl_num = ci->ctlr;    /* Get our index into the hba[] array */
1327
1328         if (func == 0) {        /* User is reading from /proc/scsi/ciss*?/?*  */
1329                 buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
1330                                 cntl_num, sh->host_no);
1331
1332                 /* this information is needed by apps to know which cciss
1333                    device corresponds to which scsi host number without
1334                    having to open a scsi target device node.  The device
1335                    information is not a duplicate of /proc/scsi/scsi because
1336                    the two may be out of sync due to scsi hotplug, rather
1337                    this info is for an app to be able to use to know how to
1338                    get them back in sync. */
1339
1340                 for (i=0;i<ccissscsi[cntl_num].ndevices;i++) {
1341                         struct cciss_scsi_dev_t *sd = &ccissscsi[cntl_num].dev[i];
1342                         buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d "
1343                                 "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
1344                                 sh->host_no, sd->bus, sd->target, sd->lun,
1345                                 sd->devtype,
1346                                 sd->scsi3addr[0], sd->scsi3addr[1],
1347                                 sd->scsi3addr[2], sd->scsi3addr[3],
1348                                 sd->scsi3addr[4], sd->scsi3addr[5],
1349                                 sd->scsi3addr[6], sd->scsi3addr[7]);
1350                 }
1351                 datalen = buflen - offset;
1352                 if (datalen < 0) {      /* they're reading past EOF. */
1353                         datalen = 0;
1354                         *start = buffer+buflen; 
1355                 } else
1356                         *start = buffer + offset;
1357                 return(datalen);
1358         } else  /* User is writing to /proc/scsi/cciss*?/?*  ... */
1359                 return cciss_scsi_user_command(cntl_num, sh->host_no,
1360                         buffer, length);        
1361
1362
1363 /* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci 
1364    dma mapping  and fills in the scatter gather entries of the 
1365    cciss command, cp. */
1366
1367 static void
1368 cciss_scatter_gather(struct pci_dev *pdev, 
1369                 CommandList_struct *cp, 
1370                 struct scsi_cmnd *cmd)
1371 {
1372         unsigned int len;
1373         struct scatterlist *sg;
1374         __u64 addr64;
1375         int use_sg, i;
1376
1377         BUG_ON(scsi_sg_count(cmd) > MAXSGENTRIES);
1378
1379         use_sg = scsi_dma_map(cmd);
1380         if (use_sg) {   /* not too many addrs? */
1381                 scsi_for_each_sg(cmd, sg, use_sg, i) {
1382                         addr64 = (__u64) sg_dma_address(sg);
1383                         len  = sg_dma_len(sg);
1384                         cp->SG[i].Addr.lower =
1385                                 (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
1386                         cp->SG[i].Addr.upper =
1387                                 (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
1388                         cp->SG[i].Len = len;
1389                         cp->SG[i].Ext = 0;  // we are not chaining
1390                 }
1391         }
1392
1393         cp->Header.SGList = (__u8) use_sg;   /* no. SGs contig in this cmd */
1394         cp->Header.SGTotal = (__u16) use_sg; /* total sgs in this cmd list */
1395         return;
1396 }
1397
1398
1399 static int
1400 cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
1401 {
1402         ctlr_info_t **c;
1403         int ctlr, rc;
1404         unsigned char scsi3addr[8];
1405         CommandList_struct *cp;
1406         unsigned long flags;
1407
1408         // Get the ptr to our adapter structure (hba[i]) out of cmd->host.
1409         // We violate cmd->host privacy here.  (Is there another way?)
1410         c = (ctlr_info_t **) &cmd->device->host->hostdata[0];   
1411         ctlr = (*c)->ctlr;
1412
1413         rc = lookup_scsi3addr(ctlr, cmd->device->channel, cmd->device->id, 
1414                         cmd->device->lun, scsi3addr);
1415         if (rc != 0) {
1416                 /* the scsi nexus does not match any that we presented... */
1417                 /* pretend to mid layer that we got selection timeout */
1418                 cmd->result = DID_NO_CONNECT << 16;
1419                 done(cmd);
1420                 /* we might want to think about registering controller itself
1421                    as a processor device on the bus so sg binds to it. */
1422                 return 0;
1423         }
1424
1425         /* printk("cciss_queue_command, p=%p, cmd=0x%02x, c%db%dt%dl%d\n", 
1426                 cmd, cmd->cmnd[0], ctlr, cmd->channel, cmd->target, cmd->lun);*/
1427         // printk("q:%p:c%db%dt%dl%d ", cmd, ctlr, cmd->channel, 
1428         //      cmd->target, cmd->lun);
1429
1430         /* Ok, we have a reasonable scsi nexus, so send the cmd down, and
1431            see what the device thinks of it. */
1432
1433         spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1434         cp = scsi_cmd_alloc(*c);
1435         spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1436         if (cp == NULL) {                       /* trouble... */
1437                 printk("scsi_cmd_alloc returned NULL!\n");
1438                 /* FIXME: next 3 lines are -> BAD! <- */
1439                 cmd->result = DID_NO_CONNECT << 16;
1440                 done(cmd);
1441                 return 0;
1442         }
1443
1444         // Fill in the command list header
1445
1446         cmd->scsi_done = done;    // save this for use by completion code 
1447
1448         // save cp in case we have to abort it 
1449         cmd->host_scribble = (unsigned char *) cp; 
1450
1451         cp->cmd_type = CMD_SCSI;
1452         cp->scsi_cmd = cmd;
1453         cp->Header.ReplyQueue = 0;  // unused in simple mode
1454         memcpy(&cp->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
1455         cp->Header.Tag.lower = cp->busaddr;  // Use k. address of cmd as tag
1456         
1457         // Fill in the request block...
1458
1459         cp->Request.Timeout = 0;
1460         memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB));
1461         BUG_ON(cmd->cmd_len > sizeof(cp->Request.CDB));
1462         cp->Request.CDBLen = cmd->cmd_len;
1463         memcpy(cp->Request.CDB, cmd->cmnd, cmd->cmd_len);
1464         cp->Request.Type.Type = TYPE_CMD;
1465         cp->Request.Type.Attribute = ATTR_SIMPLE;
1466         switch(cmd->sc_data_direction)
1467         {
1468           case DMA_TO_DEVICE: cp->Request.Type.Direction = XFER_WRITE; break;
1469           case DMA_FROM_DEVICE: cp->Request.Type.Direction = XFER_READ; break;
1470           case DMA_NONE: cp->Request.Type.Direction = XFER_NONE; break;
1471           case DMA_BIDIRECTIONAL:
1472                 // This can happen if a buggy application does a scsi passthru
1473                 // and sets both inlen and outlen to non-zero. ( see
1474                 // ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
1475
1476                 cp->Request.Type.Direction = XFER_RSVD;
1477                 // This is technically wrong, and cciss controllers should
1478                 // reject it with CMD_INVALID, which is the most correct 
1479                 // response, but non-fibre backends appear to let it 
1480                 // slide by, and give the same results as if this field
1481                 // were set correctly.  Either way is acceptable for
1482                 // our purposes here.
1483
1484                 break;
1485
1486           default: 
1487                 printk("cciss: unknown data direction: %d\n", 
1488                         cmd->sc_data_direction);
1489                 BUG();
1490                 break;
1491         }
1492
1493         cciss_scatter_gather((*c)->pdev, cp, cmd); // Fill the SG list
1494
1495         /* Put the request on the tail of the request queue */
1496
1497         spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1498         addQ(&(*c)->reqQ, cp);
1499         (*c)->Qdepth++;
1500         start_io(*c);
1501         spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1502
1503         /* the cmd'll come back via intr handler in complete_scsi_command()  */
1504         return 0;
1505 }
1506
1507 static void 
1508 cciss_unregister_scsi(int ctlr)
1509 {
1510         struct cciss_scsi_adapter_data_t *sa;
1511         struct cciss_scsi_cmd_stack_t *stk;
1512         unsigned long flags;
1513
1514         /* we are being forcibly unloaded, and may not refuse. */
1515
1516         spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1517         sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
1518         stk = &sa->cmd_stack; 
1519
1520         /* if we weren't ever actually registered, don't unregister */ 
1521         if (sa->registered) {
1522                 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1523                 scsi_remove_host(sa->scsi_host);
1524                 scsi_host_put(sa->scsi_host);
1525                 spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1526         }
1527
1528         /* set scsi_host to NULL so our detect routine will 
1529            find us on register */
1530         sa->scsi_host = NULL;
1531         spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1532         scsi_cmd_stack_free(ctlr);
1533         kfree(sa);
1534 }
1535
1536 static int 
1537 cciss_engage_scsi(int ctlr)
1538 {
1539         struct cciss_scsi_adapter_data_t *sa;
1540         struct cciss_scsi_cmd_stack_t *stk;
1541         unsigned long flags;
1542
1543         spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1544         sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
1545         stk = &sa->cmd_stack; 
1546
1547         if (sa->registered) {
1548                 printk("cciss%d: SCSI subsystem already engaged.\n", ctlr);
1549                 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1550                 return ENXIO;
1551         }
1552         sa->registered = 1;
1553         spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1554         cciss_update_non_disk_devices(ctlr, -1);
1555         cciss_scsi_detect(ctlr);
1556         return 0;
1557 }
1558
1559 static void
1560 cciss_seq_tape_report(struct seq_file *seq, int ctlr)
1561 {
1562         unsigned long flags;
1563
1564         CPQ_TAPE_LOCK(ctlr, flags);
1565         seq_printf(seq,
1566                 "Sequential access devices: %d\n\n",
1567                         ccissscsi[ctlr].ndevices);
1568         CPQ_TAPE_UNLOCK(ctlr, flags);
1569 }
1570
1571 static int wait_for_device_to_become_ready(ctlr_info_t *h,
1572         unsigned char lunaddr[])
1573 {
1574         int rc;
1575         int count = 0;
1576         int waittime = HZ;
1577         CommandList_struct *c;
1578
1579         c = cmd_alloc(h, 1);
1580         if (!c) {
1581                 printk(KERN_WARNING "cciss%d: out of memory in "
1582                         "wait_for_device_to_become_ready.\n", h->ctlr);
1583                 return IO_ERROR;
1584         }
1585
1586         /* Send test unit ready until device ready, or give up. */
1587         while (count < 20) {
1588
1589                 /* Wait for a bit.  do this first, because if we send
1590                  * the TUR right away, the reset will just abort it.
1591                  */
1592                 schedule_timeout_uninterruptible(waittime);
1593                 count++;
1594
1595                 /* Increase wait time with each try, up to a point. */
1596                 if (waittime < (HZ * 30))
1597                         waittime = waittime * 2;
1598
1599                 /* Send the Test Unit Ready */
1600                 rc = fill_cmd(c, TEST_UNIT_READY, h->ctlr, NULL, 0, 0,
1601                         lunaddr, TYPE_CMD);
1602                 if (rc == 0)
1603                         rc = sendcmd_withirq_core(h, c, 0);
1604
1605                 (void) process_sendcmd_error(h, c);
1606
1607                 if (rc != 0)
1608                         goto retry_tur;
1609
1610                 if (c->err_info->CommandStatus == CMD_SUCCESS)
1611                         break;
1612
1613                 if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
1614                         c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
1615                         if (c->err_info->SenseInfo[2] == NO_SENSE)
1616                                 break;
1617                         if (c->err_info->SenseInfo[2] == UNIT_ATTENTION) {
1618                                 unsigned char asc;
1619                                 asc = c->err_info->SenseInfo[12];
1620                                 check_for_unit_attention(h, c);
1621                                 if (asc == POWER_OR_RESET)
1622                                         break;
1623                         }
1624                 }
1625 retry_tur:
1626                 printk(KERN_WARNING "cciss%d: Waiting %d secs "
1627                         "for device to become ready.\n",
1628                         h->ctlr, waittime / HZ);
1629                 rc = 1; /* device not ready. */
1630         }
1631
1632         if (rc)
1633                 printk("cciss%d: giving up on device.\n", h->ctlr);
1634         else
1635                 printk(KERN_WARNING "cciss%d: device is ready.\n", h->ctlr);
1636
1637         cmd_free(h, c, 1);
1638         return rc;
1639 }
1640
1641 /* Need at least one of these error handlers to keep ../scsi/hosts.c from 
1642  * complaining.  Doing a host- or bus-reset can't do anything good here. 
1643  * Despite what it might say in scsi_error.c, there may well be commands
1644  * on the controller, as the cciss driver registers twice, once as a block
1645  * device for the logical drives, and once as a scsi device, for any tape
1646  * drives.  So we know there are no commands out on the tape drives, but we
1647  * don't know there are no commands on the controller, and it is likely 
1648  * that there probably are, as the cciss block device is most commonly used
1649  * as a boot device (embedded controller on HP/Compaq systems.)
1650 */
1651
1652 static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
1653 {
1654         int rc;
1655         CommandList_struct *cmd_in_trouble;
1656         unsigned char lunaddr[8];
1657         ctlr_info_t **c;
1658         int ctlr;
1659
1660         /* find the controller to which the command to be aborted was sent */
1661         c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];       
1662         if (c == NULL) /* paranoia */
1663                 return FAILED;
1664         ctlr = (*c)->ctlr;
1665         printk(KERN_WARNING "cciss%d: resetting tape drive or medium changer.\n", ctlr);
1666         /* find the command that's giving us trouble */
1667         cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
1668         if (cmd_in_trouble == NULL) /* paranoia */
1669                 return FAILED;
1670         memcpy(lunaddr, &cmd_in_trouble->Header.LUN.LunAddrBytes[0], 8);
1671         /* send a reset to the SCSI LUN which the command was sent to */
1672         rc = sendcmd_withirq(CCISS_RESET_MSG, ctlr, NULL, 0, 0, lunaddr,
1673                 TYPE_MSG);
1674         if (rc == 0 && wait_for_device_to_become_ready(*c, lunaddr) == 0)
1675                 return SUCCESS;
1676         printk(KERN_WARNING "cciss%d: resetting device failed.\n", ctlr);
1677         return FAILED;
1678 }
1679
1680 static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
1681 {
1682         int rc;
1683         CommandList_struct *cmd_to_abort;
1684         unsigned char lunaddr[8];
1685         ctlr_info_t **c;
1686         int ctlr;
1687
1688         /* find the controller to which the command to be aborted was sent */
1689         c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];       
1690         if (c == NULL) /* paranoia */
1691                 return FAILED;
1692         ctlr = (*c)->ctlr;
1693         printk(KERN_WARNING "cciss%d: aborting tardy SCSI cmd\n", ctlr);
1694
1695         /* find the command to be aborted */
1696         cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
1697         if (cmd_to_abort == NULL) /* paranoia */
1698                 return FAILED;
1699         memcpy(lunaddr, &cmd_to_abort->Header.LUN.LunAddrBytes[0], 8);
1700         rc = sendcmd_withirq(CCISS_ABORT_MSG, ctlr, &cmd_to_abort->Header.Tag,
1701                 0, 0, lunaddr, TYPE_MSG);
1702         if (rc == 0)
1703                 return SUCCESS;
1704         return FAILED;
1705
1706 }
1707
1708 #else /* no CONFIG_CISS_SCSI_TAPE */
1709
1710 /* If no tape support, then these become defined out of existence */
1711
1712 #define cciss_scsi_setup(cntl_num)
1713
1714 #endif /* CONFIG_CISS_SCSI_TAPE */